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You are interested in estimating average time spent in a day on social media by...

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You are interested in estimating average time spent in a day on social media by individuals in Arizona Suppose time spent on social media is normally distributed with a mean of 100 minutes and a variance of 400 minutes squared A sample of 16 individuals is taken and sample mean is computed Then sample mean is also normally distributed What is the variance of this sampling distribution 100 25 625 20 160000

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